new: [logrotate] add scheduler dependency to base services

logrotate/hooks/log_rotate-relation-joined

@@ -2,7 +2,18 @@
 
 ## Should be executable N time in a row with same result.
 
+## if I'm linked to a schedule-command, then add the scheduler dependency to source service
+if read-0 ts _ _ < <(get_service_relation "$SERVICE_NAME" "schedule-command"); then
+    config-add "\
+services:
+  $MASTER_BASE_SERVICE_NAME:
+    depends_on:
+      - \"$ts\"
+"
+fi
+
 exit 0
+
 . lib/common
 
 set -e